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From: Mark Mossberg <mark.mossberg@gmail.com>
To: musl@lists.openwall.com
Subject: Possible redundant `mov` in i386/x86_64 longjmp()?
Date: Tue, 12 Jan 2016 17:49:03 -0500	[thread overview]
Message-ID: <670761BD-D04A-4F3E-84F9-9AA6F66FB9FD@gmail.com> (raw)

Hi all,

I was recently perusing musl’s implementation of longjmp() for i386 and I saw that esp was restored via:

	mov 16(%edx),%ecx
	mov     %ecx,%esp

To me, it seems like the intermediary mov to %ecx is unnecessary. Could the code instead be the following?

	mov 16(%edx), %esp

Thanks,
Mark

                 reply	other threads:[~2016-01-12 22:49 UTC|newest]

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